self Maths Puzzle

Ashok got thrice as many sums wrong as he got right. If he attempted 60 sums in all, how many sums did he solved correctly?

Read Solution (Total 1)

Let the number of answers got correct by Ashok be X and the number of wrong answers be 3X.
Since he attempted 60 sums, X + 3X = 60
4X = 60
X = 15
So, Ashok had solved 15 sums correctly.
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self Other Question

If 2 n can exactly divide p! then the value of n which is not possible :
a. 43 b. 44 c. 45 d. None of these
In an Entrance examination, a multiple choice question has 5 options. If Rohit chooses the correct option, he earns 4 marks and for choosing the wrong option incurs negative marks. If Rohit chooses an option randomly, his expected score is 0. Suppose Rohit has successfully eliminated 3 incorrect options. What will be the expected score if he chooses randomly among the remaining options ?